Buying Power: 12 Notable Microsoft Acquisitions

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In a $1.2 billion deal, Microsoft acquired Yammer, an enterprise social network company, adding the company to its Microsoft Office division. At the time of the acquisition, Yammer had 5 million corporate users; today Yammer has more than 8 million corporate users, according to its website. Yammer is a social platform that allows companies to engage and collaborate in a secure environment. Yammer also allows users to stay connected to their corporate networks through iOS, Android and Windows mobile devices. Once the acquisition was made, Microsoft promised to maintain Yammer as a stand-alone service, but also pledged to "accelerate Yammer's adoption alongside complementary offerings from Microsoft SharePoint, Office 365, Microsoft Dynamics and Skype," according to a press release.